No. 1, November, 1921] PATHOLOGY 39 



233. Lance, Robert. Sur I'emploi d'ecrans colores pour combattre les maladies cryp- 

 togamiques des vegetaux. [The use of colored screens in the combating of cryptogamic dis- 

 eases of plants.] Compt. Rend. Acad. Sol. Paris 172 : 1201 , 1921 . — A colored screen permitting 

 blue, violet, and ultraviolet rays to pass is found to be useful in destroying cryptogamic organ- 

 isms causing diseases of plants, especially those on grapes. A description of the method of 

 making the screen is given. [See also following entry.] — C. H. Farr. 



234. Lance, Robert. Sur ua produit anticryptogamique. [Concerning an anticrypto- 

 gamic substance.] Compt. Rend. Acad. Sci. Paris 172: 1201-1202. 1921.— Toxic effects upon 

 parasitic fungi were obtained with light passed through screens made with zinc chloride or 

 zinc sulphate. [See also preceding entry.] — C. H. Farr. 



235. LocHHEAD, W. The story of spraying mixtures. Sci. Agric. [Canada] 1: 113-115. 

 1921. — A concise account is presented of the development of liquid and dust spraying, 

 especially from 1890 to 1920, with mention of the part played by Canadian workers. — 

 B. T. Dickson. 



236. McClintock, J. A. The control of peach brown rot and curculio. [Abstract.] Phy- 

 topathology 11: 43. 1921. 



237. Mackie, W. W., and Fred N. Briggs. Chemical dusts for the control of bunt. 

 Abstract.] Phytopathology 11: 3S-39. 1921. 



238. Petch, C. E. Spraying versus dusting. Sci. Agric. [Canada] 1: 171-172. 1921.— 

 In Quebec orchard dusting has developed rapidly in the past 8 years and has proved as 

 efBcient as spraying in controlling apple scab and biting insects. It is not yet possible to say 

 that dusting furnishes an economic control for sucking insects. — B. T. Dickson. 



239. Porter, R. H, Cooperative seed treatment using hot formaldehyde. [Abstract.] 

 Phytopathology 11: 59. 1921. 



240. Valleau, W. D. Resistance as a basis of control of corn root rot. [Abstract.] Phy- 

 topathology 11 : 34. 1921. 



241. Vaughan, R. E. Inoculated sulphur for potato scab^ control. [Abstract.] Phy- 

 topathology 11: 58. 1921. 



REGULATORY MEASURES 



242. Anonymous. Erlass des Ministers fur Landwirtschaft, Domanen und Forsten iiber 

 Bekampfung des Kartoffelkrebses. [Order of the Minister for Agriculture, Public Lands and 

 Forests relative to the potato wart disease.] Zeitschr. Kartoffelbau 1'': 59-61. 1921. — Owing 

 to the difficulty of administering wart disease control work during the war and the subsequent 

 occupation of the Rhine province, the disease has continued to spread, and strictest adher- 

 ence to provisions of the order of February, 1918, is enjoined upon all officials. The order 

 provides for notification of wart infection, destruction of diseased plants, and use of only 

 approved immune varieties. — F. Weiss. 



MISCELLANEOUS (COGNATE RESEARCHES, TECHNIQUE, ETC.) 



243. Burns, G. P. Tip-burn and the leafhopper. [Abstract.] Phytopathology 11: 

 56-57. 1921. 



244. G., R. R. [Rev. of : Smith, Erwin F. An introduction to bacterial diseases of plants. 

 XXX + 688 p. W. B. Saunders Co.: New York and London, 1920 (see Bot. Absts. 7, Entry 

 1273).] Nature 107: 168. 1921. 



245. Johnson, James. The use of sterilized soils in pathological research. [Abstract.] 

 Phytopathology 11 : 51. 1921. 



